[css-overflow] update test coverage

Author: frivoal

css-overflow-4/Overview.bs

@@ -724,6 +724,9 @@ Indicating Block-Axis Overflow: the 'block-ellipsis' property</h3>
 		block-ellipsis-invalid.html
 		block-ellipsis-valid.html
 	</wpt>
+	<wpt>
+		continue-001.html
+	</wpt>
 
 	This property allows inserting content into the last line box
 	before a [=clamp point=] or a (forced <em>or</em> unforced) <a>region break</a>
@@ -1330,6 +1333,7 @@ Handling of Excess Content: the 'continue' property</h3>
 				line-clamp-031.html
 				webkit-line-clamp-006.html
 				webkit-line-clamp-040.html
+				continue-001.html
 			</wpt>
 
 			If the box is a [=multicol container=],